Bsi bs en 00656 2000 (2006)

BS EN 656:2000This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and c

BRITISH STANDARD BS EN

656:2000

Incorporating Amendment No 1

The European Standard EN 656:1999, with the incorporation of

amendment A1:2006, has the status of a British Standard

ICS 91.140.10

BS EN 656:2000

This British Standard, having

been prepared under the

direction of the Engineering

Sector Committee, was published

under the authority of the

Standards Committee and comes

into effect on 15 February 2000

© BSI 2006

ISBN 0 580 32062 6

National foreword

This British Standard is the official English language version of

EN 656:1999, including amendment A1:2006 It partially supersedes

BS 5978-1, -2 and -3:1989 which will be withdrawn once the full series of boilers standards being prepared by CEN/TC 109 have been adopted by BSI

The start and finish of text introduced or altered by amendment is indicated in the text by tags !" Tags indicating changes to CEN text carry the number

of the CEN amendment For example, text altered by CEN amendment A1 is indicated in the text by !".

The UK participation in its preparation was entrusted to Technical Committee GSE/41, Non-domestic gas-fired central heating boilers, which has the responsibility to:

A list of organizations represented on this committee can be obtained on request to its secretary.

Cross-references

The British Standards which implement international or European

publications referred to in this document may be found in the BSI Catalogue

under the section entitled “International Standards Correspondence Index”, or

by using the “Search” facility of the BSI Electronic Catalogue or of British

— aid enquirers to understand the text;

— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed;

— monitor related international and European developments and promulgate them in the UK.

Amendments issued since publication

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5.8.5 Removal of condensate for low temperature boilers 31

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5.16 Chemical composition of the condensate for low temperature boilers 37

6.5.9 Condensate discharge blockage 45

6.8 Criteria for condensation in the flue for standard boilers 47

6.12 Condensation in a standard boiler 47



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Foreword to amendment A1

This document (EN 656:1999/A1:2006) has been prepared by Technical Committee CEN/TC109 “Central heating boilers using gaseous fuels”, the secretariat of which is held by NEN

This Amendment to the European Standard EN 656:1999 shall be given the status of a national standard, either

by publication of an identical text or by endorsement, at the latest by January 2007, and conflicting national standards shall be withdrawn at the latest by January 2007

This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s)

For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document With this amendment, the requirements and test methods for low temperature boilers and for standard boilers possibly producing condensate in certain circumstances are introduced in EN 656:1999

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

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definition 4.1.2 is limited to gas

4.3 Type of technologies

4.3.1

gas condensing boiler

boiler designed to condense permanently a large part of the water vapour contained in the combustion gases

boiler for which the average water temperature can be restricted by design

NOTE: Specific requirements and test methods for condensing boilers with heat inputs exceeding

70 kW will be the scope of a new standard

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Surfaces in contact with condensate (except purpose provided drains, water traps and siphons) shall be designed

to prevent condensate retention

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